Processing circuit for processing horizontal and vertical synchronization signals
a processing circuit and signal technology, applied in the field of video signal processing circuits, can solve the problems of inconvenient and inefficient different kvm systems to meet different requirements, and achieve the effect of reducing the number of synchronization signals
Active Publication Date: 2009-08-18
ATEN INT CO
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Benefits of technology
The present invention provides a processing circuit that can receive and convert various types of synchronization signals into a single type. The circuit can extract a vertical synchronization signal from a combined synchronization signal and select a vertical synchronization signal from a vertical synchronization composition of a combined synchronization signal and an input vertical synchronization signal. This simplifies the processing of multiple types of input signals to a single type of signal.
Problems solved by technology
It is inconvenient and inefficient for different KVM systems to meet different requirements.
Method used
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[0021]Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
[0022]FIG. 1 is a block diagram illustrating one embodiment of the processing circuit according to the invention. With reference to FIG. 1, the processing circuit is used to receive various types of horizontal and vertical synchronization signals, which may be separate or combined together, and then converts these signals into a single type of horizontal and vertical synchronization signals, which are independent of each other. The processing circuit 100 includes a first polarity converter 102, a second polarity converter 104, an extraction circuit 106, a removal circuit 108, a detection circuit 110, and a selection circuit 112.
[0023]The first polarity converter 102 receives a first synchronization s...
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A processing circuit for simplifying a plurality of types of synchronization signals into a single type of signal is described. The processing circuit has a first polarity converter, a second polarity converter, an extraction circuit, a removal circuit, a detection circuit, and a selection circuit. The extraction circuit extracts a vertical synchronization composition from an inputted synchronization signal on a first line. When an inputted vertical synchronization signal exists on a second line, the selection circuit outputs the inputted vertical synchronization signal, and when the inputted vertical synchronization signal doesn't exist on the second line, the selection circuit outputs the vertical synchronization composition extracted from the inputted synchronization signal.
Description
BACKGROUND[0001]1. Field of Invention[0002]The present invention relates to a video signal processing circuit. More particularly, the present invention relates to a processing circuit for processing horizontal and vertical synchronization signals.[0003]2. Description of Related Art[0004]There are various types of horizontal and vertical synchronization signals in the VGA Spec. They are designed to meet requirements of different display systems. The horizontal and vertical synchronization signals can be mutually independent, or combined in a single synchronization signal. FIG. 2 shows examples of different types of horizontal and vertical synchronization signals. Regarding type A, the horizontal synchronization signal 202 is independent of the vertical synchronization signal 204. Regarding type B, the horizontal synchronization signal 206 is combined with the vertical synchronization signal 208, but the vertical synchronization signal 208 still exists. Regarding type C, the horizonta...
Claims
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IPC IPC(8): H04N5/08
CPCH04N5/08G09G5/006G09G5/005
Inventor SUN, HAO
Owner ATEN INT CO